This recipe is a simple line drawing on a graph using an equation. The equation is mentioned and explained in the How It Works section. The output looks like this:
<html>
<head>
<title>Equation</title>
<script src="graphaxes.js"></script>
<script src="plotequation.js"></script>
</head>
<body onload=init()>
<canvas width="600" height="600" id="MyCanvasArea" style="border:2px solid blue;" tabindex="0">
Canvas tag is not supported by your browser
</canvas>
<br>
<form id="myform">
Select your starting value
<select name="startvalue" onclick="init()">
<option value=-10>-10</option>
<option value=-9>-9</option>
<option value=-8>-8</option>
<option value=-7>-7</option>
<option value=-6>-6</option>
<option value=-5>-5</option...